Executive producers and showrunners Aaron Harberts and Gretchen J. Berg are exiting “Star Trek: Discovery,” Variety has confirmed. Executive producer and co-creator Alex Kurtzman will take over showrunner duties for season two.

“We’ve made some producer changes at ‘Star Trek: Discovery,'” a CBS Television Studios spokesperson said in a statement. “The series continues under the creative vision and leadership of executive producer and co-creator Alex Kurtzman. ‘Discovery’ remains on course for season two in 2019 with new and continuing stories that build on its successful premiere season.”

Harberts and Berg’s exit marks the second showrunner departure for “Discovery,” as the CBS All Access drama heads into its second season. Co-creator and original showrunner Bryan Fuller exited the series months before its premiere last year following multiple delays. At the time, Harberts and Berg — longtime writing partners who had worked frequently with Fuller and were staff writers on the pilot — took over as showrunners, with Kurtzman taking on a more involved role in the big-budget drama.

Sources tell Variety that tension had been building in the writers room as work continued on season two, which remains set to premiere in 2019.

Production is well underway on “Discovery” season two, with sources indicating that five episodes are nearly complete. The show now heads into a planned production hiatus as Kurtzman, whose company Secret Hideout produces the CBS Television Studios drama, prepares to take over day-to-day management of the show. Akiva Goldsman, who had come aboard “Discovery” as executive producer for season one following Fuller’s departure, is not returning tot he show for season two.

Sign Up for Daily Insider Newsletter

Welcome back to Tune In: our weekly newsletter offering a guide to the best of the week’s TV. Each week, Variety’s TV team combs through the week’s schedule, selecting our picks of what to watch and when/how to watch them. This week, “Rent: Live” airs on Fox and “Celebrity Big Brother” returns for a second [...]

Cocaine’s a hell of a drug, but you’re not seeing things: That, indeed is Showtime’s old 1980s-era logo pasted all over marketing materials and promos for “Black Monday,” a tongue-in-cheek tale of the excesses exhibited by Wall Street traders in the lead-up to the stock market crash of 1987. The logo, which hasn’t been in [...]

This is a particularly tricky review to write, but not because the merits of “Russian Doll” are at all ambiguous. On the contrary, the show is so striking and smart that I made a note to include it on my favorite TV shows of 2019 immediately after blowing through the season — which is saying [...]

Bringing to bear a talented cast on a story of real geopolitical significance, “Black Earth Rising,” Netflix’s drama about the long-tail aftermath of the Rwandan genocide, would seem to have had the potential to be one of 2019’s early television successes. Which makes its falling short all the more painful and pronounced. The show, previously [...]

The Season 1 finale of “Dirty John” on Bravo continued the scripted show’s ratings hot streak in Live+3. The finale, which aired on Jan. 13, grew to 3.3 million viewers in delayed viewing with 1.3 million of those falling in the key adults 18-49 demographic. That is up 10% in total viewers and 15% in [...]

Qatari powerhouse beIN Media Group is calling on Hollywood to join in fighting a pirate broadcaster that it alleges has stolen billions of dollars’ worth of rights to sports events, films and TV content, and that it says has the backing of Saudi Arabia. Doha-based beIN has compiled what it calls a “dossier of evidence” [...]

Former Sky One and Sky Living programming chief Adam MacDonald has joined Possessed, and will be the ITV-owned production banner’s first chair. The U.K.-based unscripted producer has also hired Lesley Davies, former head of international production at Warner Bros. She will head up production. The double hires follow a recommission of gameshow “5 Gold Rings,” [...]